A adjective describing any situation where one feels as though their circumstance is beyond their control. It is spoken in an exclamatory fashion in order to exert power over any said event. Through it's use a humourous response is evoked from themselves as well as those around them.

When stubbing one's toe on the way to the bathroom, it is essential to scream: "Foiled!"

It can also be used as a verb.
(i.e when watching a friend fall down the stairs, "You have been foiled!")

Foiled can also be used as ownership to one's actions.

(i.e when discovering you have ran over your neighbour's cat: "Foiled! By my inability to navigate my car!")